| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 2 |
2%
|
| 1 | Yes | 28 |
27.5%
|
| 2 | No | 72 |
70.6%
|
| Sysmiss | 258 |